diff --git a/Demos3/GpuDemos/rigidbody/Bullet2FileDemo.cpp b/Demos3/GpuDemos/rigidbody/Bullet2FileDemo.cpp
index 37fa801d8..012d8645a 100644
--- a/Demos3/GpuDemos/rigidbody/Bullet2FileDemo.cpp
+++ b/Demos3/GpuDemos/rigidbody/Bullet2FileDemo.cpp
@@ -16,10 +16,16 @@ Bullet2FileDemo::~Bullet2FileDemo()
 void Bullet2FileDemo::setupScene(const ConstructionInfo& ci)
 {
 	b3Assert(ci.m_instancingRenderer);
+#ifdef __APPLE__
+//MPR doesn't work yet on Apple, so use a simpler test file
+//see bool useMpr at the top of
+//src/Bullet3OpenCL/NarrowphaseCollision/b3ConvexHullContact.cpp 
 
-	//const char* fileName="data/testFile.bullet";
+
+	const char* fileName="data/testFile.bullet";
+#else
 	const char* fileName="data/testFileFracture.bullet";
-
+#endif
 	FILE* f = 0;
 
 	const char* prefix[]={"./","../","../../","../../../","../../../../"};
diff --git a/src/Bullet3OpenCL/NarrowphaseCollision/b3ConvexHullContact.cpp b/src/Bullet3OpenCL/NarrowphaseCollision/b3ConvexHullContact.cpp
index 811046c87..ff77c059b 100644
--- a/src/Bullet3OpenCL/NarrowphaseCollision/b3ConvexHullContact.cpp
+++ b/src/Bullet3OpenCL/NarrowphaseCollision/b3ConvexHullContact.cpp
@@ -16,7 +16,11 @@ subject to the following restrictions:
 bool findSeparatingAxisOnGpu = true;
 bool splitSearchSepAxisConcave = false;
 bool splitSearchSepAxisConvex = true;
+#ifdef __APPLE__
+bool useMprGpu = false;
+#else
 bool useMprGpu = true;//use mpr for edge-edge  (+contact point) or sat. Needs testing on main OpenCL platforms, before enabling...
+#endif
 bool bvhTraversalKernelGPU = true;
 bool findConcaveSeparatingAxisKernelGPU = true;
 bool clipConcaveFacesAndFindContactsCPU = false;//false;//true;